CMMG Mk4 K 5.56mm Semi-Automatic Rifle (55ADF21)

CMMG Mk4 K 5.56mm Semi-Automatic Rifle (55ADF21)


CMMG-55ADF21

How To Buy A Firearm

We will price match any currently priced, in stock item. In some rare instances we may not be able to match a price but will do all that we can to give you the best deal possible. (We cannot match the price if it is under our cost) Please call store at 1.800.486.7497 to check availability for immediate pickup. Please review the Terms and Conditions HERE.

Type: Rifles


  • CMMG'’s primary short barreled rifle
  • Includes the RKM11 KeyMod free floating hand guard
  • Barrel is a nitrided 4140 CrMo steel 12.5” barrel
  • Includes Magpul MOE pistol grip and trigger guard, along with a magazine and CMMG’s lifetime quality guarantee
  Caliber     5.56mm  
  Barrel     12.5”" medium weight multi-role profile  
  Muzzle     A2 comp., threaded 1/2-28  
  Hand Guard     CMMG RKM11 KeyMod hand guard  
  Furniture     Magpul MOE pistol grip, MOE carbine stock with 6-pos mil-spec receiver extension  
  Receivers     Forged 7075-T6 AL M4 type upper, AR15 type lower  
  Trigger     Single stage mil-spec style trigger  
  Gas Port Location     Carbine  
  Length, in     29" (stock collapsed)  
  Weight, lbs     6 (unloaded)  


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